Question

If the mean of 25, 28, a, 30 and 32 is 27, then find the value of a.

Answer 1

a = 20

Explanation:

The mean is calculated as

mean =
`(sum)/(count)`

=
`(25+28+a+30+32)/(5)` =
`(115+a)/(5)`

Then

`(115+a)/(5)` = 27 ( multiply both sides by 5 to clear the fraction )

115 + a = 135 ( subtract 115 from both sides )

a = 20